MANITO STP - Manito, Illinois Wastewater Treatment Plant

MANITO STP is a municipal wastewater treatment plant serving the village of Manito in Mason County, Illinois. The facility handles wastewater for a population of about 1,344 people, typical of a small community in the rural Midwest. Its location at 550 North Adams Street places it within the Illinois River basin, a major tributary of the Mississippi River. As a small-scale plant in the United States, MANITO STP operates under the Clean Water Act, which requires National Pollutant Discharge Elimination System (NPDES) permits for all discharges. Plants of this size commonly employ secondary treatment (biological processes) to meet state and federal effluent standards. The Illinois Environmental Protection Agency oversees permitting and compliance for such facilities. The plant's treated effluent ultimately reaches the Illinois River, which flows into the Mississippi River and then to the Gulf of Mexico. This waterway supports diverse aquatic life and is an important migratory corridor for birds and fish. Proper treatment helps protect downstream water quality and the ecological health of the larger Mississippi River system.

MANITO STP discharges into the Illinois River watershed, which drains into the Mississippi River and eventually the Gulf of Mexico. The Illinois River supports a variety of fish species and provides habitat for migratory waterfowl. The plant's inland location means its effluent contributes to freshwater ecosystems rather than coastal marine environments.